20147445537520 has 160 divisors (see below), whose sum is σ = 54553653342720. Its totient is φ = 6776252820480.

The previous prime is 20147445537469. The next prime is 20147445537563. The reversal of 20147445537520 is 2573554474102.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 192600591 + ... + 192705169.

It is an arithmetic number, because the mean of its divisors is an integer number (340960333392).

Almost surely, 2^{20147445537520} is an apocalyptic number.

20147445537520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20147445537520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27276826671360).

20147445537520 is an abundant number, since it is smaller than the sum of its proper divisors (34406207805200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20147445537520 is a wasteful number, since it uses less digits than its factorization.

20147445537520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111143 (or 111137 counting only the distinct ones).

The product of its (nonzero) digits is 4704000, while the sum is 49.

The spelling of 20147445537520 in words is "twenty trillion, one hundred forty-seven billion, four hundred forty-five million, five hundred thirty-seven thousand, five hundred twenty".